4k only shown in top left of the screen (was previously fine)

I took my vim 3 on a trip with me and the tv I used it on was only 1080 so I changed the resolution and whitelist to match, now I’m home I’ve tried to set it back to 4k and I’ve removed all whitelist settings but whenever I set display resolution to 4k my screen is zoomed into the top left corner.
Anybody able to help me fix it?
I’ve already tried a update from stable to latest nightly

You probably used video calibration or something, follow this:

That’s fixed it, thankyou!